Transmission device, method, and recording medium

Abstract

A mechanism of modulation in a more appropriate spatial domain is to be provided.A transmission device includes a signal processing unit that applies a precoding matrix on the basis of a first bit sequence to a complex signal point sequence converted from a second bit sequence, and the precoding matrix applied to the complex signal point sequence corresponds to the first bit sequence in a predetermined combination of a first bit sequence candidate and each element of a set of precoding matrices.

The invention claimed is: 
     
       1. A transmission device comprising:
 a scrambling and interleaving circuit; 
 a constellation mapping circuit; 
 a precoding circuit that:
 receives a first bit sequence, 
 based on the first bit sequence, selects a precoding matrix from a set of precoding matrices, and 
 applies the selected precoding matrix to a complex signal point sequence to produce a precoded complex signal point sequence, 
 
 wherein the scrambling and interleaving circuit:
 receives an information bit sequence, 
 scrambles and interleaves the information bit sequence to produce a second bit sequence different from the first bit sequence, and 
 outputs the second bit sequence to the constellation mapping circuit, 
 
 wherein the constellation mapping circuit converts the second bit sequence to the complex signal point sequence, and outputs the complex signal point sequence to the precoding circuit, 
 wherein the precoding matrix applied to the complex signal point sequence corresponds to the first bit sequence according to a predetermined mapping of first bit sequence candidates and elements of the set of precoding matrices; and 
 a transceiver that transmits the precoded complex signal point sequence. 
 
     
     
       2. The transmission device according to  claim 1 , wherein elements at a specific position in a plurality of precoding matrices included in the set of precoding matrices are equal to each other. 
     
     
       3. The transmission device according to  claim 1 , wherein two different elements in the precoding matrix at least have a phase difference that is an integer multiple of a first value or an amplitude ratio that is an integer multiple or an integral submultiple of a second value. 
     
     
       4. The transmission device according to  claim 1 , wherein
 the set of precoding matrices is defined for each combination of a number of antennas and a number of spatial layers, and 
 a precoding matrix of the set of precoding matrices with fewer elements is a subset of a precoding matrix of the set of precoding matrices with more elements. 
 
     
     
       5. A transmission device comprising: a scrambling and interleaving circuit; a constellation mapping circuit; a precoding circuit that; based on a first bit sequence, selects a spatial layer from a plurality of spatial layers, and applies the selected spatial layer to a complex signal point sequence to produce spatially modulated data, wherein the scrambling and interleaving circuit; receives an information bit sequence, scrambles and interleaves the information bit sequence to produce a second bit sequence different from the first bit sequence, and outputs the second bit sequence to the constellation mapping circuit, wherein the constellation mapping circuit converts the second bit sequence to the complex signal point sequence, and outputs the complex signal point sequence to the preceding circuit, wherein the spatial layer applied to the complex signal point sequence corresponds to the first bit sequence according to a predetermined mapping of first bit sequence candidates and elements of the plurality of spatial layers; and a transmitter that transmits the spatially modulated data. 
     
     
       6. The transmission device according to  claim 5 , wherein the predetermined mapping is a mapping indicating which complex signal point set, from among a plurality of complex signal point sets, contains, as elements, at least one complex signal point mapped to each of two or more spatial layers among the plurality of spatial layers. 
     
     
       7. The transmission device according to  claim 6 , wherein the constellation mapping circuit:
 converts the second bit sequence into a temporary complex signal point sequence based on a predetermined complex signal point set, and 
 generates the complex signal point sequence by applying arithmetic processing based on the first bit sequence to each of the plurality of complex signal points included in the temporary complex signal point sequence. 
 
     
     
       8. The transmission device according to  claim 6 , wherein each of the plurality of complex signal point sets exist in a linear relationship with another of the plurality of complex signal point sets. 
     
     
       9. The transmission device according to  claim 6 , wherein each of the plurality of complex signal point sets has a same number of elements as another of the plurality of complex signal point sets or has a difference of 1 in the number of elements between each other. 
     
     
       10. The transmission device according to  claim 6 , wherein each of the plurality of complex signal point sets includes complex signal points expressed by at least one of 2{circumflex over ( )}m frequency shift keying (FSK), 2{circumflex over ( )}m amplitude shift keying (ASK), 2{circumflex over ( )}m phase shift keying (PSK), or 2{circumflex over ( )}m quadrature amplitude modulation (QAM) as elements, where m is an integer equal to or greater than zero. 
     
     
       11. The transmission device according to  claim 6 , wherein one complex signal point set among the plurality of complex signal point sets contains 2{circumflex over ( )}m elements or 1+2{circumflex over ( )}m elements, where m is the integer equal to or greater than zero. 
     
     
       12. The transmission device according to  claim 11 , wherein in a case where the complex signal point set contains 1+2{circumflex over ( )}m elements, the complex signal point set includes zero (0+0j) as an element. 
     
     
       13. The transmission device according to  claim 6 , wherein one complex signal point set among the plurality of complex signal point sets contains 1 element. 
     
     
       14. The transmission device according to  claim 5 , wherein the predetermined mapping is a mapping indicating which spatial layers, among the plurality of spatial layers, have non-zero complex signal points. 
     
     
       15. The transmission device according to  claim 5 , wherein the first bit sequence includes a bit indicating whether or not a spatial layer to which zero (0+0j) is mapped exists among the plurality of spatial layers. 
     
     
       16. The transmission device according to  claim 15 , wherein the first bit sequence includes a bit indicating that a spatial layer to which zero (0+0j) is mapped exists among the plurality of spatial layers. 
     
     
       17. The transmission device according to  claim 15 , wherein the first bit sequence includes a bit indicating whether or not a same complex signal point is mapped to a plurality of spatial layers, or whether or not a predetermined linear conversion is applied to the complex signal point. 
     
     
       18. A method, executed by a processor, comprising:
 receiving an information bit sequence; 
 scrambling and interleaving the information bit sequence in order to generate a second bit sequence, 
 converting the second bit sequence to a complex signal point sequence; 
 receiving a first hit sequence different from the second bit sequence; 
 based on the first bit sequence, selecting a precoding matrix from a set of precoding matrices; 
 applying the selected precoding matrix to the complex signal point sequence to produce a precoded complex signal point sequence, 
 wherein the precoding matrix applied to the complex signal point sequence corresponds to the first bit sequence according to a predetermined mapping of first bit sequence candidates and elements of the set of precoding matrices; and 
 transmitting the precoded complex signal point sequence. 
 
     
     
       19. A method, executed by a processor, comprising:
 receiving an information bit sequence; 
 scrambling and interleaving the information bit sequence in order to generate a second bit sequence, 
 converting the second bit sequence to a complex signal point sequence; 
 receiving a first bit sequence different from the second bit sequence; 
 based on the first bit sequence, selecting a spatial layer from a plurality of spatial layers; 
 applying the spatial layer to a complex signal point sequence to produce spatially modulated data, 
 wherein the spatial layer applied to the complex signal point sequence corresponds to the first bit sequence according to a predetermined mapping of first bit sequence candidates and elements of the plurality of spatial layers; and 
 transmitting the spatially modulated data. 
 
     
     
       20. A non-transitory computer readable produce storing a program for causing a computer to perform a method, the method comprising:
 receiving an information hit sequence; 
 scrambling and interleaving the information bit sequence in order to generate a second bit sequence, 
 converting the second bit sequence to a complex signal point sequence, 
 receiving a first bit sequence different from the second bit sequence; 
 based on the first bit sequence, selecting a precoding matrix from a set of precoding matrices; 
 applying the selected precoding matrix to the complex signal point sequence to produce a precoded complex signal point sequence, 
 wherein the precoding matrix applied to the complex signal point sequence corresponds to the first bit sequence according to a predetermined mapping of first bit sequence candidates and elements of the set of precoding matrices; and 
 transmitting the precoded complex signal point sequence. 
 
     
     
       21. A non-transitory computer readable produce storing a program for causing a computer to perform a method, the method comprising:
 receiving an information bit sequence; 
 scrambling and interleaving the information bit sequence in order to generate a second bit sequence, 
 converting the second bit sequence to a complex signal point sequence; 
 receiving a first bit sequence different from the second bit sequence; 
 based on the first bit sequence, selecting a spatial layer from a plurality of spatial layers; 
 applying the spatial layer to a complex signal point sequence to produce spatially modulated data, 
 wherein the spatial layer applied to the complex signal point sequence corresponds to the first bit sequence according to a predetermined mapping of first bit sequence candidates and elements of the plurality of spatial layers; and 
 transmitting the spatially modulated data.